Suppose you have selected a random sample of n=15 measurements from a normal distribution. Compare the standard normal z values with the corresponding tt values if you were forming the following confidence intervals. (a)    95% confidence interval z = t =  (b)    90% confidence interval z = t =  (c)    99% confidence interval z = t =

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Suppose you have selected a random sample of n=15 measurements from a normal distribution. Compare the standard normal z values with the corresponding tt values if you were forming the following confidence intervals.

(a)    95% confidence interval

z =

t = 

(b)    90% confidence interval

z =

t = 

(c)    99% confidence interval

z =

t = 

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